Some assume that spinal anesthesia is responsible for the development of any concurrent neurological manifestations. Of 482 patients whose neurological complaints seemed to be related to spinal anesthesia, 478 showed neurological complaints due to some other concurrent and entirely unrelated conditions imitating actual complications of the spinal anesthetic agent. In the majority of instances, the causative disease proves to be either an infectious neuronitis or a peripheral neuropathy. The electromyogram plays a fundamental role in the evaluation of these complications. Differentiation in the two groups of lesions is based on the following two basic elements: (1) the distribution of the denervation, that is, electromyographic changes, and (2) the time in which the denervation activity is first detected electromyographically. The prevention of misunderstanding about spinal anesthesia is of great importance.
Marinacci AA, Courville CB. ELECTROMYOGRAM IN EVALUATION OF NEUROLOGICAL COMPLICATIONS OF SPINAL ANESTHESIA. JAMA. 1958;168(10):1337–1345. doi:10.1001/jama.1958.03000100039009
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